1200947021 has 2 divisors, whose sum is σ = 1200947022. Its totient is φ = 1200947020.

The previous prime is 1200946969. The next prime is 1200947029. The reversal of 1200947021 is 1207490021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1002418921 + 198528100 = 31661^2 + 14090^2 .

It is a cyclic number.

It is not a de Polignac number, because 1200947021 - 2²⁶ = 1133838157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200947029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600473510 + 600473511.

It is an arithmetic number, because the mean of its divisors is an integer number (600473511).

Almost surely, 2^1200947021 is an apocalyptic number.

It is an amenable number.

1200947021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200947021 is an equidigital number, since it uses as much as digits as its factorization.

1200947021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 1200947021 is about 34654.6825263196. The cubic root of 1200947021 is about 1062.9380401166.

The spelling of 1200947021 in words is "one billion, two hundred million, nine hundred forty-seven thousand, twenty-one".